Photon Detection Device and a Method of Manufacturing a Photon Detection Device

2. The photon detection device of claim 1, wherein the detection regions are arranged such that, in use, light emitted from a single core of a multicore optical fibre is detected at the detection region aligned with the single core.

3. The photon detection device of claim 1, wherein every detection region of the photon detection device is aligned with a single core of the multicore optical fibre when the photon detection device is coupled to the multicore optical fibre.

4. The photon detection device of claim 1, wherein a whole of a cross-sectional area of each core overlaps with at least a portion of a cross-sectional area of a corresponding detection region when the photon detection device is coupled to the multi core optical fibre.

5. The photon detection device of claim 1, wherein each core of the multicore optical fibre is aligned with just a single detection region when the device is coupled to the multicore optical fibre.

6. The photon detection device of claim 1, wherein an area of each detection region is greater than a cross-sectional area of a corresponding core.

7. The photon detection device of claim 1, wherein each detection region has an area of less than 50 μm2.

8. The photon detection device of claim 1, wherein the shortest distance between adjacent detection regions is between 40 μm and 200 μm.

9. The photon detection device of claim 1, wherein the detection regions are arranged in a radial formation around a single detection region.

10. The photon detection device of claim 1, wherein there are less than 20 detection regions.

11. The photon detection device of claim 1, wherein the detection regions comprise avalanche multiplication regions.

12. The photon detection device of claim 1, wherein the detection regions have a rounded shape.

13. An assembly, comprising the photon detection device of claim 1, and the multicore optical fibre.

14. A quantum receiver, comprising the assembly of claim 13.

15. The quantum receiver according to claim 14, further comprising a plurality of decoding units and a multiplexing component, the multiplexing component configured to multiplex one or more outputs from the decoding units onto the multicore optical fibre.

16. The quantum receiver according to claim 15, wherein the multiplexing component is a fibre fan-out.

17. A quantum communication system, comprising a plurality of quantum transmitters and the quantum receiver according to claim 14.